The present volume grew out of a NATO Advanced Study Institute held at Sogesta, Ita1y, during the summer of 1979. We are most gratefu1 for the generous financia1 support of NATO and for the provision of trave1 funds by The National Science Foundation (Washington, D.C., U.S.A.) and Ross Laboratories (Co1umbus, Ohio, U.S.A.). The Institute cou1d not have been held in a more suitab1e p1ace nor cou1d the staff at Sogesta have been more he1pfu1. Th...
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